Relate meteor showers to comets; explain why most are annual events
What will be an ideal response?
When the Earth hits debris left behind by the break-up of old, short-period comets, these meteors come in swarms that appear to fall from the direction of the comet's orbit in space (the radiant for the shower). The Earth returns to the same point in its orbit every year, and again intercepts some of the comet debris.
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When Eratosthenes was using the well at Syene and the obelisk at Alexandria to study the Earth, what statistic was he trying to calculate?
A galvanometer calibrated to read current is
A) an ammeter. B) a voltmeter. C) an ohm meter. D) none of the above
A(n) ______________ consists of many narrow parallel slits very close together
Fill in the blank(s) with correct word
Two objects are dropped from a bridge, an interval of 1.00 s apart. What is their separation 1.00 s after the second object is released?
A) 4.90 m B) 7.35 m C) 9.80 m D) 14.7 m E) 19.8 m